Exponential Horn

Japanese: エクスポネンシャルホーン - えくすぽねんしゃるほーん
Exponential Horn

...In addition, to reproduce low frequencies adequately, the horn must be large (for example, the opening area of ​​the horn must be 1 to 4 m2). Horn shapes include parabolic horns, conical horns (cone-shaped), exponential horns (Figure 3), hyperbolic horns, stepped horns (horns whose cross-sectional area changes in a step-like manner), and multiple-coupled horns. Each type has its own advantages and disadvantages depending on the size, characteristics, and difficulty of manufacturing, but exponential horns are often used because the acoustic impedance characteristics of the horn as viewed from the throat are flat over a wide frequency range and the conversion efficiency is also good.

*Some of the terminology explanations that mention "exponential horn" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…また,低音域を十分に再生するにはホーンを大きく(例えばホーンの開口面積が1~4m2)する必要がある。 ホーンの形には,パラボリックホーン,コニカルホーン(円錐状のもの),エクスポネンシャルホーン(図3),ハイパボリックホーン,ステップホーン(ホーンの断面積が階段状に変化するもの),多数結合ホーンなどがある。ホーンの大きさ,特性,製作の難易などによりそれぞれ一長一短があるが,スロート部からホーンを見た音響インピーダンス特性が広い帯域にわたり平たんであり,かつ変換能率もよいという理由でエクスポネンシャルホーンがよく用いられている。…

※「エクスポネンシャルホーン」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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